Abstract

18-fs pulses from a self-mode-locked Ti:sapphire laser are amplified to 60
μJ of energy at 4.9 kHz with chirped-pulse
amplification in a Ti:sapphire regenerative amplifier. After recompression,
30–35-fs, near-transform-limited pulses are obtained.

Spectra of the amplified pulses for 17 (solid curve) and 90 (dashed curve)
round trips through the regenerative amplifier. Also shown for comparison is
the spectrum of the seed pulse (dotted curve) just as it enters the
amplifier.